0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 0000002 - Document - Audit Information link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 9952156 - Disclosure - Description of Business and Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - Revenue link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Investments and Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Financial Statement Components link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Goodwill and Intangible Assets link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Net Income (Loss) Per Share link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Segment and Geographical Information link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Retirement Plans link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Leases link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Acquisitions link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Restructuring link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Selected Quarterly Financial Data (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Investments and Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Financial Statement Components (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Goodwill and Intangible Assets (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Debt (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Stockholders' Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Net Income (Loss) Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Commitments and Contingencies (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Segment and Geographical Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Leases (Tables) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Acquisitions (Tables) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Tables) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Concentration Risks (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Schedule of Allowance for Doubtful Accounts (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Schedule of Property and Equipment, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Property and Equipment, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Advertising Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Commissions (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Revenue - Schedule of Contract Balances (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Revenue - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Revenue - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Investments and Fair Value Measurements - Schedule of Marketable Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Investments and Fair Value Measurements - Schedule of Gross Unrealized Losses and Fair Value of Marketable Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Investments and Fair Value Measurements - Schedule of Marketable Investments by Contractual Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Investments and Fair Value Measurements - Schedule of Assets Carried at Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Investments and Fair Value Measurements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Financial Statement Components - Schedule of Cash and Cash Equivalents (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Financial Statement Components - Schedule of Accounts Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Financial Statement Components - Schedule of Prepaid Expenses and Other Current Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Financial Statement Components - Schedule of Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Financial Statement Components - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Financial Statement Components - Schedule of Other Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Financial Statement Components - Schedule of Accrued and Other Current Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Financial Statement Components - Schedule of Other Long-term Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Goodwill and Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Goodwill and Intangible Assets - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Goodwill and Intangible Assets - Schedule of Expected Future Amortization Expense of Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Debt - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Debt - Schedule of Net Carrying Amount of Notes (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Debt - Schedule of Interest Expense Related to the Notes (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Stockholders' Equity - Capital Structure (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Stockholders' Equity - Share Repurchase Program (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Stockholders' Equity - Equity Incentive Plans (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Stockholders' Equity - Schedule of Stock Option Activities (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Stockholders' Equity - Schedule of RSU Activities (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - Stockholders' Equity - Performance-Based Restricted Stock Units (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - Stockholders' Equity - ESPP (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - Stockholders' Equity - Schedule of Stock-Based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 9955565 - Disclosure - Stockholders' Equity - Schedule of Option and ESPP Valuation Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 9955566 - Disclosure - Net Income (Loss) Per Share - Schedule of Basic and Diluted Net Loss Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955567 - Disclosure - Net Income (Loss) Per Share - Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955568 - Disclosure - Income Taxes - Schedule of Components of Loss Before Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955569 - Disclosure - Income Taxes - Schedule of Components of Provision for Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955570 - Disclosure - Income Taxes - Schedule of Effective Income Tax Amount Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 9955571 - Disclosure - Income Taxes - Schedule of Disaggregated by Material Jurisdiction (Details) link:presentationLink link:calculationLink link:definitionLink 9955572 - Disclosure - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955573 - Disclosure - Income Taxes - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955574 - Disclosure - Income Taxes - Schedule of Unrecognized Tax Benefits Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 9955575 - Disclosure - Commitments and Contingencies - Commitments (Details) link:presentationLink link:calculationLink link:definitionLink 9955576 - Disclosure - Commitments and Contingencies - Schedule of Future Minimum Lease Payments for Hosting, Telecommunication Usage Services (Details) link:presentationLink link:calculationLink link:definitionLink 9955577 - Disclosure - Commitments and Contingencies - Universal Services Fund Liability (Details) link:presentationLink link:calculationLink link:definitionLink 9955578 - Disclosure - Commitments and Contingencies - State and Local Taxes and Surcharges (Details) link:presentationLink link:calculationLink link:definitionLink 9955579 - Disclosure - Segment and Geographical Information - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955580 - Disclosure - Segment and Geographical Information - Schedule of Revenue and Property and Equipment by Geographic Region (Details) link:presentationLink link:calculationLink link:definitionLink 9955581 - Disclosure - Segment and Geographical Information - Reconciliation of Revenue from Segments to Consolidated (Details) link:presentationLink link:calculationLink link:definitionLink 9955582 - Disclosure - Retirement Plans (Details) link:presentationLink link:calculationLink link:definitionLink 9955583 - Disclosure - Leases - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955584 - Disclosure - Leases - Schedule of Lease Cost and Supplemental Cash Flow (Details) link:presentationLink link:calculationLink link:definitionLink 9955585 - Disclosure - Leases - Schedule of Balance Sheet Information Related to Leases (Details) link:presentationLink link:calculationLink link:definitionLink 9955586 - Disclosure - Leases - Schedule of Weighted Average Remaining Terms and Discount Rates (Details) link:presentationLink link:calculationLink link:definitionLink 9955587 - Disclosure - Leases - Schedule of Lease Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 9955587 - Disclosure - Leases - Schedule of Lease Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 9955588 - Disclosure - Acquisition - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955589 - Disclosure - Acquisition - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) link:presentationLink link:calculationLink link:definitionLink 9955590 - Disclosure - Restructuring (Details) link:presentationLink link:calculationLink link:definitionLink 9955591 - Disclosure - Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955592 - Disclosure - Selected Quarterly Financial Data (Unaudited) - Schedule of Allocation of Stock-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955593 - Disclosure - Selected Quarterly Financial Data (Unaudited) - Schedule of Allocation of Depreciation and Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink